如何将 WPFToolkit-Datagrid 的 selectedItem 属性绑定到我的 viewmodel 属性？

Question

我有一个 WPFToolkit-datagrid 和一个带有属性的视图模型类 - “SelectedGridItems” 如何将 WPFToolkit-Datagrid 的 selectedItem 属性绑定到我的 viewmodel 属性（“SelectedGridItems”）？

Answer 1

这是一个附加属性，它挂接到 ListBox 的 SelectionChanged 事件并将所选项目的列表填充到 ViewModel。您只需将“ListBox”更改为“DataGrid”即可。

http://marlongrech.wordpress.com /2009/06/02/sync-multi-select-listbox-with-viewmodel/

编辑： 添加 DataGrid 版本的源代码...

/// <summary>
/// Attached property that stores the selected items of a DataGrid
/// </summary>
public static class DataGridService
{
   #region SelectedItems

   /// <summary>
   /// SelectedItems Attached Dependency Property
   /// </summary>
   public static readonly DependencyProperty SelectedItemsProperty = DependencyProperty.RegisterAttached(
       "SelectedItems", 
       typeof(IList), 
       typeof(DataGridService),
       new FrameworkPropertyMetadata((IList)null, new PropertyChangedCallback(OnSelectedItemsChanged)));

   /// <summary>
   /// Gets the SelectedItems property.
   /// </summary>
   /// <param name="d"><see cref="DependencyObject"/> to get the property from</param>
   /// <returns>The value of the SelectedItems property</returns>
   public static IList GetSelectedItems(DependencyObject d)
   {
      return (IList)d.GetValue(SelectedItemsProperty);
   }

   /// <summary>
   /// Sets the SelectedItems property.
   /// </summary>
   /// <param name="d"><see cref="DependencyObject"/> to set the property on</param>
   /// <param name="value">value of the property</param>
   public static void SetSelectedItems(DependencyObject d, IList value)
   {
      d.SetValue(SelectedItemsProperty, value);
   }

   /// <summary>
   /// Handles changes to the SelectedItems property.
   /// </summary>
   /// <param name="d"><see cref="DependencyObject"/> that fired the event</param>
   /// <param name="e">A <see cref="DependencyPropertyChangedEventArgs"/> that contains the event data.</param>
   private static void OnSelectedItemsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   {
      var grid = (DataGrid)d;
      ReSetSelectedItems(grid);
      grid.SelectionChanged += delegate
      {
         ReSetSelectedItems(grid);
      };
   }

   /// <summary>
   /// Sets the selected items collection for the specified <see cref="DataGrid"/>
   /// </summary>
   /// <param name="grid"><see cref="DataGrid"/> to use for setting the selected items</param>
   private static void ReSetSelectedItems(DataGrid grid)
   {
      IList selectedItems = GetSelectedItems(grid);
      selectedItems.Clear();
      if (grid.SelectedItems != null)
      {
         foreach (var item in grid.SelectedItems)
         {
            selectedItems.Add(item);
         }
      }
   }

   #endregion
}

在 XAML 中：

<tk:DataGrid ... local:DataGridService.SelectedItems="{Binding Path=MyCollection}" SelectionMode="Extended">

“MyCollection”应该是ViewModel 中的 ObservableCollection。

Answer 2

这是 WPF4 的 DataGrid 的代码，我目前无法访问 Toolkit，但我怀疑它是不同的。

对于绑定数据网格中的单行：

<DataGrid ItemsSource="{Binding ViewModelCollectionProperty}"
SelectedItem="{Binding Path=ViewModelProperty}">

</DataGrid>

要绑定多个选定的行，最好的选择可能是创建一个附加属性，该属性维护选定项目的集合，然后可以将其数据绑定到视图模型。

编辑 - 下面添加了链接

请参阅此处，了解有关创建与您想要的非常相似的附加属性的文章：
http://alexshed.spaces.live.com/Blog/cns！ 71C72270309CE838!149.entry